Energy and Ecosystems
- Created by: 8cburton
- Created on: 28-04-15 21:35
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- Energy and ecosystems
- Energy flow through ecosystem
- Plants convert sunlight into chemical energy
- Suns energy transferred to each tropic level
- Energy lost as heat, waste and respiration
- This limits the food chain length
- Detritivores feed on small fragments of detritus
- Decomposers are microbes that obtain nutrients from dead organisms and faeces
- Energy lost as heat, waste and respiration
- Suns energy transferred to each tropic level
- Plants convert sunlight into chemical energy
- Photosynthetic efficiency is the ability of a plant to trap light energy
- Gross primary productivity
- Rate at which products are being made
- Net primary production
- GPP- repiration= net production
- secondary productivity
- herbivores don't eat all thats available and can't digest cellulose
- Herbivores have a much lower secondary productivity than carnivores
- 60% lost in faeces and urine in herbivores compared to 20% lost in carnivores
- herbivores don't eat all thats available and can't digest cellulose
- Gross primary productivity
- Pyramids of energy
- Pyramid of numbers
- Doesn't take into account size or juvenile forms
- Easy to measure
- Difficult to accurately measure
- Pyramid of energy
- Most accurate way for representing feeding relationships
- Shows the quantity of energy transferred one trophic level to the next per unit of area per unit of time
- Can make easy comparison with efficiency of energy transfer in one trophic level to the next between different communities
- Pyramid of numbers
- Community and succession
- Primary succession
- Introduction of organisms into an area not previously supported a community.
- Secondary succession
- Reintroduction of animals into a bare habitat. Rapid recolonisation
- Spores and seeds may remain in the soil helping colonisation
- Overtime species diversify until a stable state is reached- climax community
- Human management can prevent climax community
- Sheep grazing
- Farming of land
- Deforestation and soil erosion
- Heather moors are subject to management to provide ideal conditions for game birds
- Human management can prevent climax community
- Primary succession
- Energy flow through ecosystem
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